2005 Citroen C4 pressure

Downloaded from www.Manualslib.com manuals search engine 420
BRAKESBLEEDING THE BRAKING SYSTEM XSARA
Bleeding: The brakes can be bled either:
- using brake bleeding equipment, in which case the pressure of the equipment should be set to2 bars.
- or in the conventional way.
IMPERATIVE order of bleeding
Wheels:
- Rear Right.
- Front Left.
- Rear Left.
- Front Right.
Top up using brake fluid supplied by CITROËN Replacement Parts.
Angl.-t2-PAGE398-427-2005 9/01/06 10:24 Page 420

Downloaded from www.Manualslib.com manuals search engine 421
BRAKES
BRAKE SPECIFICATIONS
(*) ESP = Electronic Stability Program.
XSARA PICASSO
Mercosur Europe
Without ESP (*)
EW10J4 DW10TD TU5JP+ EW4J4 EW10J4 DW10TD
Master cylinder23,8
Master-vac/
ØMaster cylinder travel254/34
FT mm
Caliper makesLUCAS BOSCH
PistonC54/54 ZOH54/54
Disc Ventilated266
Disc thickness/min. thickness20,4/18,4 22/20
Makes/brake pad gradeJURID/3724 FERODO/769 (37)
Rear brake plates
Supplier/typeLUCAS/ENERGIT/C52980
Ø Cylinder or caliper22,2
mm Drum/Ø max.228,6/230
RR MakeABEX
Brake lining grade4930/2
Compensator/supplier/typeTEVESITTA
(load-sensitive rear braking compensator)Cut-off pressure in bars20/61,6
Angl.-t2-PAGE398-427-2005 9/01/06 10:24 Page 421

Downloaded from www.Manualslib.com manuals search engine 422
BRAKESBRAKE SPECIFICATIONS
EW4J4 EW10J4 DV6 DW10TD
Master cylinder23,8
Ø Master-vac/
mm Master cylinder travel254/35
FT Caliper makes/pistonsBOSCH ZOH54/54
Disc Ventilated283
Disc thickness/min. thickness26/24
Brake pad supplier/gradeFERODO/769 (37)
Rear brake caliper
Ø Supplier/typeTRW C38
mm Disc plain247
RR Disc thickness/min. thickness9/7
MakeGALFER
Brake lining gradeG 4554
Compensator:
On versions with ABS, there is no load-sensitive rear braking compensator
Cut-off pressure in bars
(*) ESP = Electronic Stability Program.All Types
With ESP (*)
XSARA PICASSO
Angl.-t2-PAGE398-427-2005 9/01/06 10:24 Page 422

Downloaded from www.Manualslib.com manuals search engine 429
AIR
CONDITIONING
ESSENTIAL: The compressor lubricant is extremely hygroscopic; always use FRESH oil.
Checking the compressor oil level
There are three specific cases:
- 1/Repairs to a system without leaks.
- 2/Slow leak.
- 3/Fast leak.
1/ Repairing a system without leaks.
a) - Using draining/recovery equipment not fitted with an oil decanter.
- Drain the system as slowly as possible via the LOW PRESSUREvalve, so as not to lose any oil.
- No more oil should be added when filling the system with R 134.afluid.
b) - Using draining/filling equipment fitted with an oil decanter.
- Drain the R 134.afluid from the system in accordance with the instructions in the equipment handbook.
- Measure the amount of oil recovered.
- Add the same amount of NEWoil when filling the system with R 134.afluid.
c) - Replacing a compressor.
- Remove the old compressor, drain it and measure the oil quantity.
- Drain the new compressor
(supplied full), so that the same amount of NEWoil is left in the compressor as was in the old compressor.
- No more oil should be added when filling the system with R 134.a fluid.
SPECIAL FEATURES: AIR CONDITIONING SYSTEM (R 134.a)
Compressor lubricant
Angl.-t2-page428-456-2005 9/01/06 10:25 Page 429

Downloaded from www.Manualslib.com manuals search engine 430
AIR
CONDITIONING
Checking the compressor oil level (continued)
2/ Slow leak.
Slow leaks do not lead to oil loss, therefore the same procedure should be followed as if there was no leak at all.
3/ Fast leak.
This type of leak causes both oil loss as well as allowing air to enter the system.
It is therefore necessary to:
- Replace the dehydrator.
- Drain as much oil as possible
(when replacing the faulty component).
Either before or during filling of the system with R 134.afluid, introduce 80 ccof NEWoil into the circuit.
When changing one of the following components, add the quantity stated:
- A drying bottle : 15 ccof compressor oil.
- A condenser or an evaporator : 20 ccof compressor oil.
- High pressure or low pressure pipework : 5 ccof compressor oil.
- A drying cartridge : 15 ccof compressor oil.
SPECIAL FEATURES: AIR CONDITIONING SYSTEM (R 134.a)
Angl.-t2-page428-456-2005 9/01/06 10:25 Page 430

Downloaded from www.Manualslib.com manuals search engine 440
AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Interpretation of the measurements.
«m»:High pressure.«s»:Over-heating (SC).
«n»:High temperature.«t»:Ambient air temperature.
«p»:Under-cooling (SR).«u»:Blown air temperature.
«q»:Low pressure.«v»: Humidity.
«r»:Low temperature.«w»: Temperature T3.
Under-cooling.
The under-cooling represents the difference between the condensation temperature and the aircon
fluid temperature at the aircon condenser outlet.
The under-cooling gives the quantity of aircon fluid
(in the liquid state)in the air conditioning circuit.
Values for under-cooling (SR).
Values «p» Origins Solutions
SR < 2°CLack of aircon fluid in the aircon condenser
(should be more than 150grammes)
Add some
2°C < SR <4°CLack of aircon fluid in the aircon condenser aircon fluid
(should be around 100to 150grammes)
4°C < SR < 10°C/12°CCorrect quantity
SR > 10°C/12°CRemove some
Excess aircon fluid in the aircon condenser aircon fluid
SR > 15°C
Blown air temperature «u».
The blown air temperature should be between 2°Cand 10°C.
E5AP2FBC
Angl.-t2-page428-456-2005 9/01/06 10:25 Page 440

Downloaded from www.Manualslib.com manuals search engine 441
AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Interpretation of the measurements.
«m»:High pressure.«s»: Over-heating (SC).
«n»:High temperature.«t»:Ambient air temperature.
«p»:Under-cooling (SR).«u»:Blown air temperature.
«q»:Low pressure.«v»:Humidity.
«r»: Low temperature.«w»: Temperature T3.
Over-heating (SC).
The over-heating represents the difference between the aircon fluid temperature at the evaporator outlet
and the evaporation temperature.
The over-heating gives the quantity of aircon fluid (in the liquid state) in the air conditioning circuit
Values for over-heating (SC).
Values «s» Origins Solutions
2° < SC < 15°CCorrect quantity
SC > 15°CLack of aircon fluid in the cooling circuitAdd some
aircon fluid
SC < 2°CExcess aircon fluid in the cooling circuitRemove some
aircon fluid
Blown air temperature «u».
The blown air temperature should be between 2°Cand 10°C.
E5AP2FBC
Angl.-t2-page428-456-2005 9/01/06 10:25 Page 441

Downloaded from www.Manualslib.com manuals search engine AIR
CONDITIONING
443
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table
Principal problem Symptom Possible causes
Aircon compressor clutch
Lack of aircon fluid in the aircon circuit
The clutch of the aircon compressor does not Aircon pressostat
engage, or disengages suddenly Aircon evaporator sensor
The aircon compressor does not turn Electrical circuit
(wiring, fuses, etc.)
or stops suddenly
Auxiliaries drive belt
Aircon compressor
The clutch of the aircon compressor remains Filtering and drying cartridge
engaged and stops suddenly
Aircon pressure reducer
Leak of aircon fluid
Aircon compressor clutch
Angl.-t2-page428-456-2005 9/01/06 10:25 Page 443